Merge bitcoin#15829: qt: update request payment button text and tab d…

…escription

81b2830 qt: update request payment button text and tab description (Tobias Kaderle)

Pull request description:

  Rebased and squashed version of bitcoin#14484.

  ![create new address](https://user-images.githubusercontent.com/863730/56212202-1f665980-608c-11e9-80d8-87a6211a9def.png)

  ![addresses dialog](https://user-images.githubusercontent.com/863730/56212205-22614a00-608c-11e9-83e4-efe531ea6070.png)

ACKs for commit 81b283:
  MarcoFalke:
    utACK 81b2830
  jonasschnelli:
    utACK 81b2830
  meshcollider:
    utACK bitcoin@81b2830

Tree-SHA512: 96c6dc1f08560066110ec916b0a8879265db46174a5c5993332509b6bceb93ed6a8e06e3e8bd382e35aacc1c4d4a2458ec1d065213060db34ded4f0b2683964a

src/qt/addressbookpage.cpp

@@ -99,7 +99,7 @@ AddressBookPage::AddressBookPage(Mode _mode, Tabs _tab, QWidget* parent) :
         ui->newAddress->setVisible(true);
         break;
     case ReceivingTab:
-        ui->labelExplanation->setText(tr("These are your Dash addresses for receiving payments. It is recommended to use a new receiving address for each transaction."));
+        ui->labelExplanation->setText(tr("These are your Dash addresses for receiving payments. Use the 'Create new receiving address' button in the receive tab to create new addresses."));
         ui->deleteAddress->setVisible(false);
         ui->newAddress->setVisible(false);
         break;

src/qt/forms/receivecoinsdialog.ui

@@ -108,7 +108,7 @@
              </size>
             </property>
             <property name="text">
-             <string>&amp;Request payment</string>
+             <string>&amp;Create new receiving address</string>
             </property>
             <property name="autoDefault">
              <bool>false</bool>